it's made of feelings/thoughts, sometime subtle and sneaky, not even thoughts with words but just some background mental activity.
When the observer is made of feelings, do you mean sensations or emotions?
What makes a thought sneaky?
There are two types of thoughts:
(1) Thoughts with words “Here is cup”
(2) Visual mental images of a ‘cup’
Is the background mental activity, the thoughts without words, visual mental images?
Think of a cup. Get a very clear picture in your mind. See clearly the size, shape, color and volume of the cup. Notice whether it is decorated or plain. Notice whether it has a handle. Notice whether it is heavy or fragile. Do you have a clear picture in mind?
Now, can you physically grasp that image of a cup?
Can you pour tea into it?
Can you drink from it?
Is there a ‘real’ cup or just an image of a cup?
Is there an appearing mental image?
Is the content of the mental image (the cup) ‘real’?
The thoughts and mental images are real only as arising thoughts and mental images, their ‘presence’ cannot be denied. However their contents, what are they about are not ‘real’, they are just fantasies. Can you see this?
So continue to notice the content of thoughts.
Whenever there is an arising thought or mental image, check whether its content (what it’s about) is really happening, or the content is just pure imagination.
Which type of thought is the 'I' thought when it is present?
Is there a visual mental image of observer?
I had some glimpses but only limited to sounds or items in direct contact with my body. I only had one "full glimpse" years ago.
Did this glimpse (or glimpses) result in a kind of KNOWING that has never really left?
....In other words is it clear that this mirage is not real even though the visual field still shows something there?
Sometimes effort appear, by itself I guess, just like thoughts.
Yes. What is it like to sink into this appearance, for the effort to be unowned?